Compound Interest Calculator - Free Online Tool | Shining Toolbox
Calculate how your money grows with compound interest and monthly contributions. See the power of compounding over time.
Compound Interest Calculator
See how your money grows with compound interest
Future Value
$0.00
Total Contributions
$0.00
Interest Earned
$0.00
About Compound Interest Calculator
How to Use the Compound Interest Calculator
- Enter your initial deposit (principal)
- Input the annual interest rate
- Set the investment period in years
- Add optional monthly contributions
- Choose compounding frequency
The Power of Compounding
Example: $10,000 at 7% annual return:
- After 10 years: $19,672
- After 20 years: $38,697
- After 30 years: $76,123
Adding $200/month contributions at 7%:
- After 30 years: $319,000+
Investment Rule of 72
To estimate how long it takes to double your money, divide 72 by your interest rate. At 7% return, your money doubles in about 10.3 years.
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